Using VlanId String None instead of -1

Change-Id: I2597ac37285cc3f40ad1304d668564a56a5b862f
diff --git a/core/api/src/test/java/org/onosproject/net/ConnectPointTest.java b/core/api/src/test/java/org/onosproject/net/ConnectPointTest.java
index 2aecabd..7bf3def 100644
--- a/core/api/src/test/java/org/onosproject/net/ConnectPointTest.java
+++ b/core/api/src/test/java/org/onosproject/net/ConnectPointTest.java
@@ -83,7 +83,7 @@
         String cp = "16:3A:BD:6E:31:E4/-1/1";
 
         ConnectPoint connectPoint = ConnectPoint.hostConnectPoint(cp);
-        assertEquals("16:3A:BD:6E:31:E4/-1", connectPoint.hostId().toString());
+        assertEquals("16:3A:BD:6E:31:E4/None", connectPoint.hostId().toString());
         assertEquals("1", connectPoint.port().toString());
 
         expectHostParseException("");